Johannes Sleidanus or Sleidan (1506 – 31 October 1556) was a
Luxembourg
Luxembourg, officially the Grand Duchy of Luxembourg, is a landlocked country in Western Europe. It is bordered by Belgium to the west and north, Germany to the east, and France on the south. Its capital and most populous city, Luxembour ...
ish
historian
A historian is a person who studies and writes about the past and is regarded as an authority on it. Historians are concerned with the continuous, methodical narrative and research of past events as relating to the human species; as well as the ...
and annalist of the
Reformation
The Reformation, also known as the Protestant Reformation or the European Reformation, was a time of major Theology, theological movement in Western Christianity in 16th-century Europe that posed a religious and political challenge to the p ...
.
Life
He was born at
Schleiden
Schleiden () is a town in North Rhine-Westphalia, Germany. It lies in the Eifel hills, in the district of Euskirchen (district), Euskirchen, and has 12,998 inhabitants as of 30 June 2017. Schleiden is connected by a tourist railway to Kall, German ...
in the
Duchy of Luxembourg
The Duchy of Luxembourg (; ; ; ) was a Imperial state, state of the Holy Roman Empire, the ancestral homeland of the noble House of Luxembourg. The House of Luxembourg became one of the most important political forces in the 14th century, comp ...
, then part of the
Habsburg Netherlands
Habsburg Netherlands were the parts of the Low Countries that were ruled by sovereigns of the Holy Roman Empire's House of Habsburg. This rule began in 1482 and ended for the Northern Netherlands in 1581 and for the Southern Netherlands in 1797. ...
. He studied humanities at
Leuven University
KU Leuven (Katholieke Universiteit Leuven) is a Catholic research university in the city of Leuven, Belgium. Founded in 1425, it is the oldest university in Belgium and the oldest university in the Low Countries.
In addition to its main campus ...
and
Cologne University
The University of Cologne () is a university in Cologne, Germany. It was established in 1388. It closed in 1798 before being re-established in 1919. It is now one of the largest universities in Germany with around 45,187 students. The Universit ...
, and law and
jurisprudence
Jurisprudence, also known as theory of law or philosophy of law, is the examination in a general perspective of what law is and what it ought to be. It investigates issues such as the definition of law; legal validity; legal norms and values ...
at
Paris
Paris () is the Capital city, capital and List of communes in France with over 20,000 inhabitants, largest city of France. With an estimated population of 2,048,472 residents in January 2025 in an area of more than , Paris is the List of ci ...
and
Orléans
Orléans (,"Orleans" (US) and Renaissance humanists of Leuven, he had adopted
Protestant
Protestantism is a branch of Christianity that emphasizes Justification (theology), justification of sinners Sola fide, through faith alone, the teaching that Salvation in Christianity, salvation comes by unmerited Grace in Christianity, divin ...
opinions, and entering the service of Cardinal du Bellay, was employed in the futile negotiations of the French court to make an alliance with the German Protestants against the
Emperor Charles V
Charles V (24 February 1500 – 21 September 1558) was Holy Roman Emperor and Archduke of Austria from 1519 to 1556, King of Spain (as Charles I) from 1516 to 1556, and Lord of the Netherlands as titular Duke of Burgundy (as Charles II) fr ...
. In 1542 he settled in
Strasbourg
Strasbourg ( , ; ; ) is the Prefectures in France, prefecture and largest city of the Grand Est Regions of France, region of Geography of France, eastern France, in the historic region of Alsace. It is the prefecture of the Bas-Rhin Departmen ...
.
Sleidanus had been accustomed to copy all papers bearing upon the Reformation to which he had access, and
Martin Bucer
Martin Bucer (; Early German: ; 11 November 1491– 28 February 1551) was a German Protestant reformer based in Strasbourg who influenced Lutheran, Anglican doctrines and practices as well as Reformed Theology. Bucer was originally a memb ...
, who had seen his collection, proposed to
Philip of Hesse
Philip I, Landgrave of Hesse (13 November 1504 – 31 March 1567), nicknamed (), was a German nobleman and champion of the Protestant Reformation, notable for being one of the most important of the early Protestant rulers in Germany. He was o ...
to appoint him historian of the Reformation, giving him a salary and access to all necessary documents. After some delay the heads of the
league of Schmalkalden
The Schmalkaldic League (; ; or ) was a military alliance of Lutheran principalities and cities within the Holy Roman Empire during the mid-16th century. It received its name from the town of Schmalkalden, where the group was founded in 1531. ...
agreed to the proposal, and Sleidanus began his great work, finishing the first volume in 1545.
In that year he was recalled to diplomacy, and went to England in a French embassy to
Henry VIII
Henry VIII (28 June 149128 January 1547) was King of England from 22 April 1509 until his death in 1547. Henry is known for his Wives of Henry VIII, six marriages and his efforts to have his first marriage (to Catherine of Aragon) annulled. ...
. While there he collected materials for his history. On his return he represented Strasbourg at the
diet
Diet may refer to:
Food
* Diet (nutrition), the sum of the food consumed by an organism or group
* Dieting, the deliberate selection of food to control body weight or nutrient intake
** Diet food, foods that aid in creating a diet for weight loss ...
s of
Frankfurt
Frankfurt am Main () is the most populous city in the States of Germany, German state of Hesse. Its 773,068 inhabitants as of 2022 make it the List of cities in Germany by population, fifth-most populous city in Germany. Located in the forela ...
and
Worms
The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms.
Content
The content of the registry is edited and maintained by scien ...
, and went on to
Marburg
Marburg (; ) is a college town, university town in the States of Germany, German federal state () of Hesse, capital of the Marburg-Biedenkopf Districts of Germany, district (). The town area spreads along the valley of the river Lahn and has ...
to explore the archives of Philip of Hesse.
The war of the league of Schmalkalden interfered with this work, and also prevented the payment of Sleidanus, who in his difficulties applied to England for aid, and at Cranmer's intercession received a yearly pension from
Edward VI
Edward VI (12 October 1537 – 6 July 1553) was King of England and King of Ireland, Ireland from 28 January 1547 until his death in 1553. He was crowned on 20 February 1547 at the age of nine. The only surviving son of Henry VIII by his thi ...
, which, however, was never paid out.
In 1551 Sleidanus went to the
Council of Trent
The Council of Trent (), held between 1545 and 1563 in Trent (or Trento), now in northern Italy, was the 19th ecumenical council of the Catholic Church. Prompted by the Protestant Reformation at the time, it has been described as the "most ...
as representative from Strasbourg, charged also with full powers to act for the imperial cities of Esslingen,
Ravensburg
Ravensburg ( or ; Swabian: ''Raveschburg'') is a city in Upper Swabia in Southern Germany, capital of the district of Ravensburg, Baden-Württemberg.
Ravensburg was first mentioned in 1088. In the Middle Ages, it was an Imperial Free City and ...
,
Reutlingen
Reutlingen (; ) is a city in Baden-Württemberg, Germany. It is the capital of the eponymous Reutlingen (district), district of Reutlingen. As of June 2018, it had an estimated population of 116,456. Reutlingen has a Reutlingen University, univ ...
Lindau
Lindau (, ''Lindau am Bodensee''; ; Low Alemannic German, Low Alemannic: ''Lindou'') is a major Town#Germany, town and Lindau (island), island on the eastern side of Lake Constance (''Bodensee'' in German) in Bavaria, Germany. It is the capital ...
. Soon afterwards he became a civil servant of the city of Strasbourg, and finished his great task in 1554, though lack of money and other misfortunes compelled him to delay printing. Sleidanus died in poverty at Strasbourg in October 1556.
The book appeared in the preceding year, ''Commentariorum de statu religionis et reipublicae'', Carolo V. Caesare, libri XXVI.; it was translated into English by John Daus in 1560 and by G. Bohun in 1689. It was drafted with some care for impartiality, but this approach pleased no one, not even
Melanchthon
Philip Melanchthon (born Philipp Schwartzerdt; 16 February 1497 – 19 April 1560) was a German Lutheran reformer, collaborator with Martin Luther, the first systematic theologian of the Protestant Reformation, an intellectual leader of the L ...
. It remains a valuable contemporary history of the times of the Reformation, and contains a large collection of documents.
Posthumous
A street in the Neustadt district of Strasbourg is named after him (''Rue Sleidan'').